Battle of Bautzen

In the Battle of Bautzen, a combined Prusso–Russian army, that was massively outnumbered, was pushed back by Napoleon but escaped destruction, with some sources claiming that Marshal Michel Ney failed to block their retreat. The Prussians under General Gebhard Leberecht von Blücher and Russians under General Peter Wittgenstein, retreating after their defeat at Lützen were attacked by French forces under Napoleon.

Source: Wikipedia